CN103760024A - Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times - Google Patents
Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times Download PDFInfo
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- CN103760024A CN103760024A CN201410042870.5A CN201410042870A CN103760024A CN 103760024 A CN103760024 A CN 103760024A CN 201410042870 A CN201410042870 A CN 201410042870A CN 103760024 A CN103760024 A CN 103760024A
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Abstract
The invention belongs to the field of rock performance tests and specifically relates to a method for objectively determining crack initiation strength of a rock based on accumulated sound emission impact times. The purpose is to accurately identify the crack initiation strength value. The method comprises the followings: preparing a cylindrical rock test piece, installing the rock test piece on a test sample table of a press machine, installing a sound emission sensor in the middle part of a rock sample, uniaxially loading the rock test piece, synchronizing the sound emission monitoring and the loading process, acquiring the data of axial stress and accumulated sound emission impact times in real time, acquiring a curve of the accumulated sound emission impact times changing along with the time, drawing a curve of the relation between the axial stress and the accumulated sound emission impact times, calculating the difference of the accumulated sound emission impact times according to the relation curve, and drawing a relation schema of the difference of the accumulated sound emission impact times and the axial stress, wherein the stress corresponding to the peak of the difference of the accumulated sound emission impact times is the crack initiation strength of the rock. The method eliminates the subjective judgment of a user, and guarantees the uniqueness of the solution.
Description
Technical field
The invention belongs to performances of rock field tests, be specifically related to the acoustic emission based on accumulative total and clash into the method that the objective definite rock of number opens resistance to spalling.
Background technology
Rock stress destruction process is the process of its inner micro rupture germinating, expansion and perforation.Its damage and fracture process under contractive condition can mainly be divided into several important stages: (1) closing of fracture; (2) elastic deformation; (3) crack is initial; (4) crack stable development; (5) crack connects; (6) astable crack development; (7) destroy; (8) destroy after-stage.Wherein, the initial corresponding stress level in crack is called rock and opens resistance to spalling.Opening resistance to spalling (σ ci) is one of rock key character stress value in fail in compression process, rationally determines that this stress value is for describing the mechanical behavior of rock and predicting that the cleavage fracture of Underground Engineering Excavation boundary vicinity is significant.At present, international rock mechanics and engineering association (ISRM) has set up cleavage fracture prediction (the Commission on Spall Predictions) council, and one of important goal of this council is to propose definite method that rock opens resistance to spalling.Yet up to the present, also not yet form in the world clear and definite suggesting method and determine that rock opens resistance to spalling under Uniaxial Compression.
The method that existing mensuration rock opens resistance to spalling under Uniaxial Compression mainly comprises ess-strain method and acoustic-emission two classes.Ess-strain method is to utilize the axial and transverse strain sheet that sticks on rock sample surface, or be arranged on the vertical and horizontal extensometer on rock sample, in Failure under Uniaxial Compression, record axial stress, and the strain of measuring respectively two direction, then draw axial stress and strain (axially, horizontal and bulk strain) relation curve, and do tangent line on bulk strain-axial stress curve, when curve departs from tangent line, corresponding axial stress is the resistance to spalling that opens of rock.Yet ess-strain method depends on the form of bulk strain and axial stress relation curve strongly, when voltage signal unstable and while causing stress-strain curve to occur fluctuation, just can not accurately differentiate the position of deviated line point.In addition, the method has subjectivity to a great extent, and it depends on the naked eyes judgement of user to this deviation point strongly, draw thus to open resistance to spalling value just no longer objective.Research shows, in rock failure process, produce a large amount of acoustic emission informations, adopt sound emission monitoring technology, can Real-Time Monitoring rock material the dynamic evolution of inner micro rupture, the essential characteristic that can reflect the deformation and failure of rock according to the variation of Rock Acoustic Emission Signal, and set up the mutual relationship of acoustic emission signal and rock failure process, with the failure mechanism of this study of rocks.In acoustic emission method, the resistance to spalling that opens of rock is determined in the variation of the real-time acoustic emission parameters that many employings show with histogram.Its interpretation according to being: in the uniaxial loading starting stage, acoustic emission signal is faint, and along with the increase of axle pressure, rock starts to occur once significant acoustie emission event, and now corresponding axial stress is the resistance to spalling that opens of rock.Yet, because acoustic emission monitor(ing) signal is subject to the high susceptibility of force-responsive and the interference of ground unrest for rock, rock also may detect stronger acoustic emission signal in hole crack densification stage and elastic deformation stage, thereby has disturbed for the accurate identification of opening resistance to spalling value.Therefore, the present invention is exactly in this case, has developed a kind of method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number is provided, to opening resistance to spalling value, accurately identify.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Based on accumulative total, the method that the objective definite rock of number opens resistance to spalling is clashed in acoustic emission, comprises the following steps successively:
Step S1: prepare columniform rock sample;
Step S2: rock sample is arranged on the sample bench of pressing machine, and at this rock sample middle part, calibrate AE sensor is installed;
Step S3: rock sample is carried out to uniaxial loading, keep acoustic emission monitor(ing) to synchronize and carry out with loading procedure, logarithmic data is clashed in Real-time Collection axial stress and accumulative total acoustic emission;
Step S4: obtain accumulative total acoustic emission and clash into number curve over time;
Step S5: draw axial stress and the relation curve that adds up acoustic emission shock number;
Step S6: calculate accumulative total acoustic emission according to relation curve and clash into number difference;
Step S7: draw accumulative total acoustic emission and clash into the graph of a relation of number difference and axial stress, in figure, the resistance to spalling that opens that the corresponding stress of number difference peak value is rock is clashed in accumulative total acoustic emission.
The method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number as above, wherein: described step S6 is specifically divided into:
Step S(6.1) find out and solve the upper change point that rock opens resistance to spalling: according to step S5 acquired results, from relation curve, any point in recessed stage starts to curve end point, make each point and initial point line on curve, get line slope minimum point as the upper change point that solves rock and open resistance to spalling;
Step S(6.2): find out and solve the lower-limit point that rock opens resistance to spalling: according to step S6 acquired results, first point recording from curve starts to finish to the last point of upper change point, make each point and upper change point line, getting line slope minimum point is to solve the lower-limit point that rock opens resistance to spalling;
Step S(6.3): according to step S(6.1) and step (S6.2) acquired results, the upper change point in annexation curve and the line of lower-limit point are as with reference to line;
Step S(6.4): according to step S(6.3) acquired results, between the bound on calculated relationship curve, accumulative total acoustic emission is clashed into the accumulative total acoustic emission that number is corresponding with reference line under identical stress level and is clashed into the poor of number, adds up acoustic emission and clashes into number difference.
The method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number as above, wherein: the change curve in described step S4 comprises following three kinds of different shapes:
(a) tangent slope on curve reduces gradually with the increase of axial stress, and curve is concave;
(b) tangent slope is tending towards constant with the increase of axial stress subsequently, linearly shape;
(c) tangent slope increases gradually with the increase of axial stress subsequently, presents spill.
The method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number as above, wherein: the height of described rock sample is 2:1 with diameter ratio.
The method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number as above, wherein: the acoustic emission of described accumulative total is clashed into logarithmic data by calibrate AE sensor collection being installed on described rock sample, calibrate AE sensor piezoelectric ceramics surface is directly contacted with rock sample surface, and surface of contact scribbles skim vaseline as couplant.
The method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number as above, wherein: described pressing machine is that the model that Chaoyang, Changchun test apparatus company limited produces is TAW-2000 microcomputer controlled electro-hydraulic servo rock mechanics experiment machine.
The present invention provides a kind of new method for identifying the resistance to spalling that opens of rock under contractive condition, its feature is as follows: 1, do not re-use strain measurement, but utilize acoustic emission monitor(ing) and conventional compression test, be technological means, the axial stress of take is interpretation foundation with the variation relation of accumulative total acoustic emission shock number; 2, the method has been removed user's subjective judgement, has guaranteed to ask uniqueness of solution.3, the method will not be forced into macroscopic failure by rock sample, thereby has saved test period, simply efficient, is easy to apply.
Accompanying drawing explanation
Fig. 1 is a kind of process flow diagram that opens the method for resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number provided by the invention;
Fig. 2 is the location drawing of calibrate AE sensor under Uniaxial Compression in the present invention;
Fig. 3 is that in the present invention, the lower particulate of Uniaxial Compression clashes into number graph of a relation over time containing the acoustic emission of spot black mica granodiorite accumulative total;
Fig. 4 utilizes axial stress to solve middle particulate with accumulative total acoustic emission shock number relation curve to open resistance to spalling upper limit figure containing spot black mica granodiorite under Uniaxial Compression in the present invention;
Fig. 5 utilizes axial stress to solve middle particulate with accumulative total acoustic emission shock number relation curve to open resistance to spalling lower limit figure containing spot black mica granodiorite under Uniaxial Compression in the present invention;
Fig. 6 is that in the present invention, the lower particulate of Uniaxial Compression clashes into the interval partial enlarged drawing of bound in number relation curve containing spot black mica granodiorite axial stress and accumulative total acoustic emission;
Fig. 7 is that in the present invention, the lower particulate of Uniaxial Compression clashes into the graph of relation of number difference containing spot black mica granodiorite axial stress and accumulative total acoustic emission;
Fig. 8 clashes into number graph of a relation over time containing grain black mica monzonitic granite accumulative total acoustic emission in spot under Uniaxial Compression in the present invention;
Fig. 9 be in the present invention under Uniaxial Compression test specimen utilize axial stress and accumulative total acoustic emission to clash into number relation curve to solve containing grain black mica monzonitic granite in spot and open resistance to spalling upper limit figure;
Figure 10 utilizes axial stress to solve containing grain black mica monzonitic granite in spot and open resistance to spalling lower limit figure with accumulative total acoustic emission shock number relation curve under Uniaxial Compression in the present invention;
Figure 11 clashes into the interval partial enlarged drawing of bound in number relation curve containing grain black mica monzonitic granite axial stress in spot and accumulative total acoustic emission under Uniaxial Compression in the present invention;
Figure 12 clashes into the graph of relation of number difference containing grain black mica monzonitic granite axial stress in spot with accumulative total acoustic emission under Uniaxial Compression in the present invention;
Figure 13 be in the present invention under Uniaxial Compression the acoustic emission of coarse-grained grandiorte accumulative total clash into number graph of a relation over time;
Figure 14 utilizes axial stress to solve coarse-grained grandiorte with accumulative total acoustic emission shock number relation curve to open resistance to spalling upper limit figure under Uniaxial Compression in the present invention;
Figure 15 utilizes axial stress to solve coarse-grained grandiorte with accumulative total acoustic emission shock number relation curve to open resistance to spalling lower limit figure under Uniaxial Compression in the present invention;
Figure 16 be in the present invention under Uniaxial Compression coarse-grained grandiorte axial stress clash into the interval partial enlarged drawing of bound in number relation curve with accumulative total acoustic emission;
Figure 17 be in the present invention under Uniaxial Compression coarse-grained grandiorte axial stress clash into the graph of relation of number difference with accumulative total acoustic emission;
In figure, 1. rock sample, 2. calibrate AE sensor, 3. vaseline.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.
As shown in Figure 1, a kind of method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number, comprises the following steps successively:
Step S1: the complete core that scene is drilled through is processed, and prepares columniform rock sample;
Step S2: rock sample is arranged on the sample bench of pressing machine, and at this rock sample middle part, calibrate AE sensor is installed, conventionally make calibrate AE sensor piezoelectric ceramics surface directly contact with test specimen surface, surface of contact scribbles skim vaseline as couplant;
Step S3: rock sample is carried out to uniaxial loading, keep acoustic emission monitor(ing) to synchronize and carry out with loading procedure, logarithmic data is clashed in Real-time Collection axial stress and accumulative total acoustic emission;
Step S4: obtain accumulative total acoustic emission and clash into number curve over time.In the original upload stage, the tangent slope on curve reduces gradually with the increase of axial stress, and curve is concave, and it characterizes rock interior hole crack in the densification stage; Tangent slope is tending towards constant with the increase of axial stress subsequently, shape linearly, and it characterizes rock elasticity deformation stage; Tangent slope increases gradually with the increase of axial stress subsequently, presents spill, and it characterizes the rock fracture steady growth stage.When curve possesses above-mentioned three kinds of different shapes, off-test;
Step S5: draw axial stress and the relation curve that adds up acoustic emission shock number;
Step S6: calculate accumulative total acoustic emission according to relation curve and clash into number difference; Specifically be divided into:
Step S(6.1) find out and solve the upper change point that rock opens resistance to spalling: according to step S5 acquired results, from relation curve, any point in recessed stage starts to curve end point, make each point and initial point line on curve, get line slope minimum point as the upper change point that solves rock and open resistance to spalling;
Step S(6.2): find out and solve the lower-limit point that rock opens resistance to spalling: according to step S6 acquired results, first point recording from curve starts to finish to the last point of upper change point, make each point and upper change point line, getting line slope minimum point is to solve the lower-limit point that rock opens resistance to spalling;
Step S(6.3): according to step S(6.1) and step (S6.2) acquired results, the upper change point in annexation curve and the line of lower-limit point are as with reference to line;
Step S(6.4): according to step S(6.3) acquired results, between the bound on calculated relationship curve, accumulative total acoustic emission is clashed into the accumulative total acoustic emission that number is corresponding with reference line under identical stress level and is clashed into the poor of number, adds up acoustic emission and clashes into number difference;
Step S7: draw accumulative total acoustic emission and clash into the graph of a relation of number difference and axial stress, in figure, the resistance to spalling that opens that the corresponding stress of number difference peak value is rock is clashed in accumulative total acoustic emission.
Different rocks are carried out to operation instructions computation process below:
(1) be under Uniaxial Compression, to adopt accumulative total acoustic emission to clash into number to determine that middle particulate, containing the resistance to spalling that opens of spot black mica granodiorite, now carries out following operation:
(1) complete core For Hlw Geological Repository pre-selected zone, Xinjiang being drilled through is processed, be prepared into height with diameter than being the cylindrical rock sample of 2:1, the rock sample diameter that this example adopts is 50mm, and height is 100mm, and rock type is that middle particulate is containing spot black mica granodiorite.
(2) rock sample is arranged on the sample bench of pressing machine, pressing machine model is that Chaoyang, TAW-2000(Changchun test apparatus company limited produces).
(3) as shown in Figure 2, at this rock sample 1 middle part, 1 calibrate AE sensor 2 is installed, sensor model number is: Micro30(U.S. physical acoustics company produces), calibrate AE sensor piezoelectric ceramics surface is directly contacted with rock sample surface, surface of contact has skim vaseline 3 as couplant.
(4) adopt the two kinds of load controlling mode of pressing machine to carry out uniaxial loading to test specimen, loading speed is made as 0.75MPa/s, keep acoustic emission monitoring system record to synchronize with pressing machine loading procedure, acoustic emission monitoring system model is: PCI-2(U.S. physical acoustics company produces).
(5) as shown in Figure 3, on the display screen of acoustic emission monitoring system the accumulative total transmitting of observation sound clash into number over time curve (transverse axis is the time, the longitudinal axis is accumulative total acoustic emission shock number), in the original upload stage, tangent slope on curve reduces gradually with the increase of axial stress, curve is concave, and it characterizes the rock interior hole crack densification stage; Tangent slope is tending towards constant with the increase of axial stress subsequently, shape linearly, and it characterizes rock elasticity deformation stage; Last tangent slope increases gradually with the increase of axial stress, presents spill, and it characterizes the rock fracture steady growth stage.When curve possesses above-mentioned three kinds of different shapes, off-test.
(6) as shown in Figure 4,, according to step (5) acquired results, draw axial stress and clash into number graph of relation with accumulative total acoustic emission.
(7) as shown in Figure 4, from relation curve a, any point b in recessed stage starts to finish to curve end point c, makes the line of these data points and initial point d, gets line slope minimum point e and solves the upper change point that opens resistance to spalling;
(8) as shown in Figure 5, from first a of curve, start to finish to the last data point of upper change point, make these data points and upper change point b line, get line slope minimum point c and solve the lower-limit point that opens resistance to spalling;
(9) as shown in Figure 6, the lower-limit point a in junction curve and upper change point b, form straight line c, is reference line.
(10) as shown in Figure 6, solving on relation curve opened between the bound of resistance to spalling, calculates the accumulative total acoustic emission corresponding with reference line under identical stress level of accumulative total acoustic emission shock numerical value and clashes into the poor of numerical value, is accumulative total acoustic emission and clashes into number difference d;
(11) as shown in Figure 7, make between upper change point a and lower-limit point b the graph of a relation that number difference and axial stress are clashed in accumulative total acoustic emission, what the corresponding stress of peak value that in figure, number difference is clashed in accumulative total acoustic emission was rock opens resistance to spalling d.
(2) for adopting accumulative total acoustic emission to clash into number under Uniaxial Compression, determine the resistance to spalling that opens containing grain black mica monzonitic granite in spot, now carry out following operation:
(1) complete core For Hlw Geological Repository pre-selected zone, Xinjiang being drilled through is processed, be prepared into height with diameter than being the cylindrical rock sample of 2:1, the rock sample diameter that this example adopts is 50mm, and height is 100mm, and rock type is for containing grain black mica monzonitic granite in spot.
(2) rock sample is arranged on the sample bench of pressing machine, pressing machine model is that Chaoyang, TAW-2000(Changchun test apparatus company limited produces).
(3) as shown in Figure 2, at this rock sample 1 middle part, 1 calibrate AE sensor 2 is installed, sensor model number is: Micro30(U.S. physical acoustics company produces), calibrate AE sensor piezoelectric ceramics surface is directly contacted with rock sample surface, surface of contact has skim vaseline 3 as couplant.
(4) adopt the two kinds of load controlling mode of pressing machine to carry out uniaxial loading to test specimen, loading speed is made as 0.75MPa/s, keep acoustic emission monitoring system record to synchronize with pressing machine loading procedure, acoustic emission monitoring system model is: PCI-2(U.S. physical acoustics company produces).
(5) as shown in Figure 8, on the display screen of acoustic emission monitoring system the accumulative total transmitting of observation sound clash into number over time curve (transverse axis is the time, the longitudinal axis is accumulative total acoustic emission shock number), in the original upload stage, tangent slope on curve reduces gradually with the increase of axial stress, curve is concave, and it characterizes the rock interior hole crack densification stage; Tangent slope is tending towards constant with the increase of axial stress subsequently, shape linearly, and it characterizes rock elasticity deformation stage; Last tangent slope increases gradually with the increase of axial stress, presents spill, and it characterizes the rock fracture steady growth stage.When curve possesses above-mentioned three kinds of different shapes, off-test.
(6) as shown in Figure 9,, according to step (5) acquired results, draw axial stress and clash into number graph of relation with accumulative total acoustic emission.
(7) as shown in Figure 9, from relation curve a, any point b in recessed stage starts to finish to curve end point c, makes the line of these data points and initial point d, gets line slope minimum point e and solves the upper change point that opens resistance to spalling;
(8) as shown in figure 10, from first a of curve, start to finish to the last data point of upper change point, make these data points and upper change point b line, get line slope minimum point c and solve the lower-limit point that opens resistance to spalling;
(9) as shown in figure 11, the lower-limit point a in junction curve and upper change point b, form straight line c, is reference line.
(10) as shown in figure 11, solving on relation curve opened between the bound of resistance to spalling, calculates the accumulative total acoustic emission corresponding with reference line under identical stress level of accumulative total acoustic emission shock numerical value and clashes into the poor of numerical value, is accumulative total acoustic emission and clashes into number difference d;
(11) as shown in figure 12, make between upper change point a and lower-limit point b the graph of a relation that number difference and axial stress are clashed in accumulative total acoustic emission, what the corresponding stress of peak value that in figure, number difference is clashed in accumulative total acoustic emission was rock opens resistance to spalling d.
(3) for adopting accumulative total acoustic emission to clash into the resistance to spalling that opens that number is determined coarse-grained grandiorte under Uniaxial Compression, now carry out following operation:
(1) complete core Bei Shan Mountain For Hlw Geological Repository pre-selected zone being drilled through is processed; be prepared into height with diameter than being the cylindrical rock sample of 2:1; the rock sample diameter that this example adopts is 50mm, and height is 100mm, and rock type is coarse-grained grandiorte.
(2) rock sample is arranged on the sample bench of pressing machine, pressing machine model is that Chaoyang, TAW-2000(Changchun test apparatus company limited produces).
(3) as shown in Figure 2, at this rock sample 1 middle part, 1 calibrate AE sensor 2 is installed, sensor model number is: Micro30(U.S. physical acoustics company produces), calibrate AE sensor piezoelectric ceramics surface is directly contacted with rock sample surface, surface of contact has skim vaseline 3 as couplant.
(4) adopt the two kinds of load controlling mode of pressing machine to carry out uniaxial loading to test specimen, loading speed is made as 0.75MPa/s, keep acoustic emission monitoring system record to synchronize with pressing machine loading procedure, acoustic emission monitoring system model is: PCI-2(U.S. physical acoustics company produces).
(5) as shown in figure 13, on the display screen of acoustic emission monitoring system the accumulative total transmitting of observation sound clash into number over time curve (transverse axis is the time, the longitudinal axis is accumulative total acoustic emission shock number), in the original upload stage, tangent slope on curve reduces gradually with the increase of axial stress, curve is concave, and it characterizes the rock interior hole crack densification stage; Tangent slope is tending towards constant with the increase of axial stress subsequently, shape linearly, and it characterizes rock elasticity deformation stage; Last tangent slope increases gradually with the increase of axial stress, presents spill, and it characterizes the rock fracture steady growth stage.When curve possesses above-mentioned three kinds of different shapes, off-test.
(6) as shown in figure 14, draw axial stress and clash into number graph of relation with accumulative total acoustic emission.
(7) as shown in figure 14, from relation curve a, any point b in recessed stage starts to finish to curve end point c, makes the line of these data points and initial point d, gets line slope minimum point e and solves the upper change point that opens resistance to spalling;
(8) as shown in figure 15, from first a of curve, start to finish to the last data point of upper change point, make these data points and upper change point b line, get line slope minimum point c and solve the lower-limit point that opens resistance to spalling;
(9) as shown in figure 16, the lower-limit point a in junction curve and upper change point b, form straight line c, is reference line.
(10) as shown in figure 16, solving on relation curve opened between the bound of resistance to spalling, calculates the accumulative total acoustic emission corresponding with reference line under identical stress level of accumulative total acoustic emission shock numerical value and clashes into the poor of numerical value, is accumulative total acoustic emission and clashes into number difference d;
(11) as shown in figure 17, make between upper change point a and lower-limit point b the graph of a relation that number difference and axial stress are clashed in accumulative total acoustic emission, what the corresponding stress of peak value that in figure, number difference is clashed in accumulative total acoustic emission was rock opens resistance to spalling d.
Claims (6)
1. based on accumulative total, the method that the objective definite rock of number opens resistance to spalling is clashed in acoustic emission, comprises the following steps successively:
Step S1: prepare columniform rock sample;
Step S2: rock sample is arranged on the sample bench of pressing machine, and at this rock sample middle part, calibrate AE sensor is installed;
Step S3: rock sample is carried out to uniaxial loading, keep acoustic emission monitor(ing) to synchronize and carry out with loading procedure, logarithmic data is clashed in Real-time Collection axial stress and accumulative total acoustic emission;
Step S4: obtain accumulative total acoustic emission and clash into number curve over time;
Step S5: draw axial stress and the relation curve that adds up acoustic emission shock number;
Step S6: calculate accumulative total acoustic emission according to relation curve and clash into number difference;
Step S7: draw accumulative total acoustic emission and clash into the graph of a relation of number difference and axial stress, in figure, the resistance to spalling that opens that the corresponding stress of number difference peak value is rock is clashed in accumulative total acoustic emission.
As claimed in claim 1 based on accumulative total acoustic emission clash into the method that the objective definite rock of number opens resistance to spalling, it is characterized in that: described step S6 is specifically divided into:
Step S(6.1) find out and solve the upper change point that rock opens resistance to spalling: according to step S5 acquired results, from relation curve, any point in recessed stage starts to curve end point, make each point and initial point line on curve, get line slope minimum point as the upper change point that solves rock and open resistance to spalling;
Step S(6.2): find out and solve the lower-limit point that rock opens resistance to spalling: according to step S6 acquired results, first point recording from curve starts to finish to the last point of upper change point, make each point and upper change point line, getting line slope minimum point is to solve the lower-limit point that rock opens resistance to spalling;
Step S(6.3): according to step S(6.1) and step (S6.2) acquired results, the upper change point in annexation curve and the line of lower-limit point are as with reference to line;
Step S(6.4): according to step S(6.3) acquired results, between the bound on calculated relationship curve, accumulative total acoustic emission is clashed into the accumulative total acoustic emission that number is corresponding with reference line under identical stress level and is clashed into the poor of number, adds up acoustic emission and clashes into number difference.
As claimed in claim 1 or 2 based on accumulative total acoustic emission clash into the method that the objective definite rock of number opens resistance to spalling, it is characterized in that: the change curve in described step S4 comprises following three kinds of different shapes:
(a) tangent slope on curve reduces gradually with the increase of axial stress, and curve is concave;
(b) tangent slope is tending towards constant with the increase of axial stress subsequently, linearly shape;
(c) tangent slope increases gradually with the increase of axial stress subsequently, presents spill.
4. the method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number according to claim 3, is characterized in that: the height of described rock sample is 2:1 with diameter ratio.
According to claim 4 based on accumulative total acoustic emission clash into the method that the objective definite rock of number opens resistance to spalling, it is characterized in that: the acoustic emission of described accumulative total is clashed into logarithmic data by calibrate AE sensor collection being installed on described rock sample, calibrate AE sensor piezoelectric ceramics surface is directly contacted with rock sample surface, and surface of contact scribbles skim vaseline as couplant.
6. the method that opens resistance to spalling based on the objective definite rock of accumulative total acoustic emission shock number according to claim 5, is characterized in that: described pressing machine is that the model that Chaoyang, Changchun test apparatus company limited produces is TAW-2000 microcomputer controlled electro-hydraulic servo rock mechanics experiment machine.
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